CN115159928A - Low-carbon green lightweight concrete aggregate and preparation method thereof - Google Patents
Low-carbon green lightweight concrete aggregate and preparation method thereof Download PDFInfo
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- CN115159928A CN115159928A CN202210884793.2A CN202210884793A CN115159928A CN 115159928 A CN115159928 A CN 115159928A CN 202210884793 A CN202210884793 A CN 202210884793A CN 115159928 A CN115159928 A CN 115159928A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00224—Green materials, e.g. porous green ceramic preforms
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a low-carbon green lightweight concrete aggregate and a preparation method thereof, belonging to the technical field of building materials. The paint comprises the following components in parts by weight: cement: low-carbon active fine powder: light active ultrafine material: light organic fine powder: light mixed fine aggregate: combining fibers: YZ-1 type homogeneity regulator: high-performance additive: water =400 to 1200:50 to 300: 80-200: 200 to 300 parts by weight: 70-200: 3.5-6.0: 2.0-5.0: 12.4 to 20.0:300 to 360. Weighing and stirring the materials in proportion to obtain mixed slurry, tabletting, slitting, rounding the mixed slurry to form spherical particles, curing the spherical particles at room temperature for 20 to 24 hours, and placing the spherical particles in a standard concrete curing room for curing for 28 days to obtain the low-carbon green lightweight concrete aggregate.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a low-carbon green lightweight concrete aggregate and a preparation method thereof.
Background
With the continuous development of economy and building technology, the green, low-carbon and functional requirements of buildings are continuously improved, and the light building material integrating light weight, heat preservation, energy conservation, waste utilization, low carbon and environmental protection is researched and developed from the material body, so that the significance is great. However, the main light building materials at present comprise ceramsite, aerated block, lightweight aggregate concrete and the like, and cannot meet the requirements of modern buildings. Therefore, the research and development of the low-carbon green lightweight concrete aggregate which is suitable for modern buildings has important significance.
For example, prior art one, application No.: CN202110355252.6, publication No.: CN113083408A discloses a method for preparing recycled concrete aggregate by using building solid waste, and the technical scheme is as follows:
the method for manufacturing the recycled concrete aggregate by using the building solid waste uses equipment for manufacturing the recycled concrete aggregate by using the building solid waste, the equipment for manufacturing the recycled concrete aggregate comprises a bottom plate, a U-shaped frame, a feeding device, a supporting device, a crushing device and a discharging device, and when the equipment for manufacturing the recycled concrete aggregate is used for recycling the building solid waste, the specific method is as follows:
s1, equipment inspection: before the equipment for manufacturing recycled concrete aggregate by using building solid waste is used for manufacturing recycled concrete aggregate, the equipment is checked;
s2, feeding treatment: after the equipment is checked, manually or mechanically placing the building solid waste on a feeding device, so that the feeding device performs feeding treatment on the building solid waste, and the building solid waste is conveyed to a supporting device;
s3, crushing treatment: when the building solid waste is fed, the crushing device extrudes and impacts the supporting device, so that the crushing device and the supporting device crush the building solid waste;
s4, blanking treatment: after the building solid waste is crushed, screening the building solid waste through a blanking device, so that the blanking device separates the reinforcing steel bars from the concrete blocks, and collecting and blanking the reinforcing steel bars and the concrete blocks;
s5, preparing aggregate: after the reinforcing steel bars and the concrete blocks are separated and collected, the reinforcing steel bars and the concrete blocks are made into aggregate of recycled concrete in a manual or mechanical mode;
the middle part of the upper end of the bottom plate is provided with a U-shaped frame, the upper end of the U-shaped frame is provided with a feeding device, the middle part of the upper end of the bottom plate is provided with a supporting device, a crushing device is arranged above the supporting device, the crushing device is arranged at the upper end of the inner side of the U-shaped frame, and the right side of the supporting device is provided with a discharging device;
support arrangement includes the mounting panel, the bracing piece, damping spring, the swash plate, baffle and horizontal bar, bottom plate upper end mid-mounting has the mounting panel, the equal slidable mounting of four corners of mounting panel has the bracing piece, the bracing piece lower extreme passes through damping spring and links to each other with the mounting panel, the swash plate is installed to the bracing piece upper end, the baffle is installed to the symmetry around the swash plate upper end, evenly be provided with the horizontal bar backward in the past between the baffle, and the horizontal bar is installed on the swash plate, concrete during operation, loading attachment carries abandonment coincide floor to the swash plate on, carry out crushing treatment through breaker to it, abandonment coincide floor fragmentation process, through breaker extrusion swash plate, make the swash plate descend along the mounting panel through bracing piece extrusion damping spring, thereby make swash plate and breaker carry out the breakage to abandonment coincide floor, and the baffle avoids abandonment coincide floor to break away from the swash plate, the horizontal bar makes things convenient for swash plate and breaker to smash abandonment coincide floor abandonment, damping spring conveniently cushions the swash plate simultaneously, avoid the circumstances that swash plate and breaker direct impact lead to the damage.
Breaker includes the air pump, first broken mechanism and secondary crushing mechanism, the air pump is installed in bottom plate upper end left side, first broken mechanism is installed to U-shaped frame inboard upper end, secondary crushing mechanism is installed to symmetry around first broken mechanism upper end, concrete during operation, abandonment coincide floor is carried to the swash plate on the back, drive first broken mechanism through the air pump and descend, make first broken mechanism and swash plate carry out first breakage to abandonment coincide floor, abandonment coincide floor is first after the breakage, carry out the secondary through secondary crushing mechanism and hit the breakage processing to abandonment coincide floor, thereby guarantee that abandonment coincide floor is abundant broken.
First broken mechanism includes broken cylinder, the strengthening rib, the crushing plate, guide bar and deflector, U-shaped frame inboard upper end mid-mounting has broken cylinder, install the strengthening rib between broken cylinder and the U-shaped frame, and symmetrical arrangement around the strengthening rib, the crushing plate is installed to the end that stretches out of broken cylinder, the guide bar is installed to crushing plate upper end bilateral symmetry, guide bar upper end slidable mounting has the deflector, the deflector is installed at broken cylinder shell downside, concrete during operation, the end that stretches out that drives broken cylinder through the air pump descends, make the end that stretches out of broken cylinder descend and drive the crushing plate and descend along the deflector with the guide bar, thereby make the crushing plate and swash plate carry out the first processing of smashing to abandonment coincide floor.
Unloader includes flitch, connecting rod, dead lever, sliding block, filter screen, coupling spring and collects the frame down, and the flitch is installed down through the bearing to the swash plate right-hand member, and the connecting rod is installed to flitch symmetry around the flitch, and the connecting rod is articulated to have the dead lever, and the symmetry is installed on the mounting panel around the dead lever, and the mounting panel right-hand member has the sliding block from the past backward slidable mounting, the filter screen is installed to the sliding block right-hand member, and installs coupling spring between sliding block lower extreme and the mounting panel, and the collection frame is installed on bottom plate upper end right side, and during concrete work, when abandonment coincide floor is broken, through the swash plate extrusion decline of breaker, make the dead lever extrusion connecting rod, make the connecting rod drive the flitch rotation down, thereby make the flitch carry out the abandonment coincide floor after the breakage to the filter screen down, thereby make the filter screen separate reinforcing bar and concrete, when the filter screen separates reinforcing bar and concrete, drive sliding block extrusion coupling spring and go up and down, thereby make the filter screen carry out vibratory screening to reinforcing bar and concrete, guarantee reinforcing bar and concrete and fully separate.
According to a preferable technical scheme, the feeding device comprises a feeding motor, supporting plates, a rope seat, a steel wire rope, a reversing wheel, a feeding frame and supporting columns, wherein the feeding motor is installed on the front side of the upper end of a U-shaped frame, the supporting plates are symmetrically installed on the front and back of the middle of the upper end of the U-shaped frame, the rope seat is installed between the supporting plates through a bearing, the steel wire rope is wound on the outer side of the middle of the rope seat, the reversing wheel is installed on the upper side of the left end of the U-shaped frame, the feeding frame is installed on the lower end of the left side of the U-shaped frame through a pin shaft, the supporting columns are installed on the left side of the upper end of a bottom plate, the lower ends of the steel wire ropes are connected with the left side of the upper end of the feeding frame through the reversing wheel, and during specific work, the waste laminated floor slabs are placed in the feeding frame in a manual or mechanical mode, the rope seat is driven to rotate through the feeding motor, the rope seat is made to wind the steel wire rope, the steel wire rope is made to drive the feeding frame to rotate upwards through reversing rotation, and the feeding frame, so that the feeding frame feeds the waste laminated floor slabs, and the waste laminated floor slabs are conveyed to the supporting devices.
According to a preferable technical scheme, the secondary crushing mechanism comprises a connecting frame, a sliding rod, a pressing block, a reset spring and a knocking plate, the connecting frame is mounted at the upper end of the crushing plate, the sliding rod is uniformly mounted in the middle of the connecting frame in a sliding fit mode from left to right, the pressing block is mounted at the upper end of the sliding rod, the reset spring is arranged between the connecting frame and the pressing block, the reset spring is sleeved at the upper end of the sliding rod, the knocking plate is mounted at the lower end of the sliding rod, and the knocking plate is slidably mounted in the crushing plate.
As a preferred technical scheme of the invention, the inclined plate is of a downward inclined structure from left to right, and the downward inclined structure of the inclined plate facilitates the inclined plate to perform blanking treatment on the crushed composite floor slab.
As a preferred technical scheme of the invention, the filter screen is of an arc-shaped structure, the effective working area of the filter screen is increased by the arc-shaped structure, and the separation effect of the steel bars and the concrete is ensured.
As a preferred technical scheme of the invention, the outer side of the reversing wheel is provided with an arc-shaped groove, the steel wire rope is clamped in the arc-shaped groove, and the arc-shaped groove prevents the steel wire rope from separating from the reversing wheel in the working process.
As a preferred technical scheme, the lower end of the crushing plate is of a tooth-shaped structure, the crushing plate is evenly provided with the sliding grooves from front to back, the lower end of the knocking plate is slidably mounted in the sliding grooves, the tooth-shaped structure is convenient for the crushing plate to crush the waste composite floor slab, and the sliding grooves are convenient for the knocking plate to crush the waste composite floor slab for the second time.
For example, prior art two, application No.: CN202010392459.6, publication No.: CN111530545B discloses a method for preparing single waste-doped concrete aggregate by using building solid waste, which adopts the following technical scheme:
the invention discloses a method for manufacturing single waste-doped concrete aggregate by utilizing solid construction waste, which adopts a single waste-doped concrete aggregate processing device, wherein the single waste-doped concrete aggregate processing device comprises a crushing frame, a conduction frame, a blanking frame, a crushing mechanism, a barrier plate and a protection mechanism, the crushing frame is of a square frame structure, the top and the bottom of the crushing frame are respectively provided with the conduction frame and the blanking frame, the lower end of the conduction frame and the upper end of the blanking frame are both of inward arranged inclined structures, the crushing mechanism is arranged in the middle of the crushing frame, the barrier plates are respectively arranged on the left inner side surface and the right inner side surface of the middle of the conduction frame through hinges, and the bottom of each barrier plate is provided with the protection mechanism.
The crushing mechanism comprises a crushing motor, a driving rotating shaft, a driven rotating shaft, a connecting support, a crushing roller and a transmission gear, wherein the driving rotating shaft and the driven rotating shaft are respectively positioned at the left end and the right end in the crushing frame;
the linking bridge is L type structure, the upper end of linking bridge is installed on the upper end leading flank of smashing the frame, driven rotating shaft's front end passes through the bearing and installs on the right-hand member of linking bridge, all install a crushing roller on the middle part of initiative pivot and driven rotating shaft, all be connected with a drive gear on the front end of initiative pivot and driven rotating shaft, drive gear is located and smashes the frame front side, and two drive gear mesh mutually, concrete during operation, rubbing crusher constructs can carry out shredding to construction waste, the rotation of crushing motor can drive two crushing rollers and smash the discarded object.
The bottom of barrier plate be provided with the rebound board, the rebound board is connected with the inner of resilience spring, the outer end of resilience spring is installed on the lower extreme medial surface of conduction frame, when building discarded object fell on the barrier plate, the barrier plate can turn to automatically for the discarded object falls between two crushing rollers, when barrier plate and discarded object separation, the barrier plate can reply initial position under the effect of resilience spring.
The method for manufacturing the single-doped waste concrete aggregate by adopting the single-doped waste concrete aggregate processing device comprises the following steps:
s1, crushing waste: firstly, crushing construction waste with larger size, and sorting and recovering reinforcing steel bars and iron wires of the construction waste;
s2, throwing waste: the preliminarily crushed construction waste is put into the conduction frame from the upper end of the conduction frame, and the barrier plate can automatically turn over when the construction waste is put into the conduction frame, so that the barrier plate buffers and guides the construction waste, and the construction waste can fall between the two crushing rollers;
s3, crushing waste: when the construction waste is thrown in, the crushing motor is started, the two crushing rollers are matched to crush the construction waste, the protection mechanism can protect the waste on the crushing rollers, the extruded construction waste is prevented from bouncing upwards, and the crushed construction waste slides off the blanking frame;
s4, screening and collecting waste: the waste can fall into the screening machine from the blanking frame, the screening machine can screen the crushed waste into building aggregates with different specifications, then the light impurities in the building aggregates with higher cleanliness requirement are removed by the air separation machine, and finally the building aggregates with different specifications are separately collected.
As a preferred technical scheme of the invention, the protection mechanism comprises a protection elastic column, a protection plate, a guide rod and an inserting column, the upper end of the protection elastic column is arranged on the bottom of a barrier plate, the lower end of the protection elastic column is provided with the protection plate, the front side and the rear side of the protection plate are respectively provided with the guide rod in an arc structure, the left end of the guide rod is arranged on the inner side surface of the left end of a conduction frame, the inner side surface of the guide rod is provided with an arc groove, the front side and the rear side of the protection plate are respectively provided with the inserting column, one end of the inserting column, far away from the side wall of the protection plate, is positioned in the right end of the arc groove on the guide rod, the axial lead of the arc surface of the guide rod in which the arc structure is positioned below the axial lead of a hinge rotating shaft on the barrier plate, the arrangement ensures that the protection elastic column can automatically perform contraction motion when the inserting column slides in the arc groove of the guide rod, when the waste crushing roller is in specific work, the protection mechanism can protect the extruded building waste, and synchronously rotate along with the blocking plate, the building waste can generate splashing of waste particles when being extruded, thereby having hidden danger of hurting people, the protection plate can block the splashed particles, and the waste particles are guided and moved to the crushing roller, the protection plate can also press the waste on the crushing roller, so that the crushing roller can crush the waste, the waste is prevented from rolling when the smooth waste of the outer side surface contacts with the crushing roller, the waste cannot be crushed, when the waste is placed on the blocking plate, the blocking plate can rotate, the plug posts on the protection plate can slide in the arc grooves on the guide rods at the moment, and the protection plate can not prevent the waste from falling onto the crushing roller.
As a preferred technical scheme of the invention, the crushing units are uniformly arranged on the outer side surfaces of the crushing rollers from front to back, the crushing units on the two crushing rollers are arranged in a staggered manner, the arc-shaped grooves are uniformly arranged on the outer side surfaces of the crushing rollers along the circumferential direction of the crushing rollers, the arc-shaped grooves are uniformly arranged from front to back, the arc-shaped grooves on the crushing rollers and the crushing units are circularly arranged in a staggered manner, the positions of the crushing units on one side of the crushing roller correspond to the positions of the arc-shaped grooves on the other side of the crushing roller one by one, and the crushing units are matched with the arc-shaped grooves on the crushing rollers to thoroughly crush wastes.
As a preferred technical scheme of the invention, the crushing unit comprises an extrusion block and a crushing pressing block, the extrusion block and the crushing pressing block are uniformly arranged on the outer side surface of the crushing roller, the extrusion block and the crushing pressing block are arranged in a staggered manner, the length of the crushing pressing block is greater than that of the extrusion block, the outer side surfaces of the extrusion block and the crushing pressing block are both arc surfaces, the outer side surfaces of the extrusion block and the crushing pressing block are both provided with arc pressing blocks, the extrusion block and the crushing pressing block are arranged at different heights so that construction waste can be crushed into different sizes, and the arc pressing blocks on the extrusion block and the crushing pressing block can prevent the waste from slipping during extrusion, thereby reducing the splashing frequency of the particle waste during extrusion and crushing.
As a preferred technical solution of the present invention, the upper side surface of the extrusion block in the counterclockwise direction is an inclined surface arranged downward, the upper end of the crushing press block in the counterclockwise direction is a pointed structure, the pointed structure of the crushing press block can crush large-sized construction waste, a part of the crushed waste can slide down along the inclined surface of the extrusion block so that the extrusion block crushes the waste, the other part of the crushed waste can crush the crushed waste while the crushing press block continues to rotate, the extrusion block can extrude the waste into large-sized granular aggregate, and the crushing press block can extrude the waste into small-sized granular aggregate.
As a preferable technical scheme of the invention, the inner side face of the upper end of each blocking plate is provided with an inclined chamfer, a certain distance is reserved between the two blocking plates, the inclined chamfers on the blocking plates enable the construction waste to fall downwards from the space between the two blocking plates, and the blocking plates can be prevented from being incapable of rotating by a certain distance.
As a preferred technical solution of the present invention, blocking guide blocks are distributed below the protection plate, the lower side surface of each blocking guide block is an arc surface, the inner side surface of each blocking guide block is an inclined surface, the blocking guide blocks are located outside the crushing roller, the top of each blocking guide block is mounted on the bottom of the guide rod, the blocking guide blocks can prevent building waste from splashing to the outside of the crushing roller when the building waste is crushed by the pointed structure of the crushing press blocks, and the inclined surfaces of the inner side surfaces of the blocking guide blocks enable the waste on the blocking guide blocks to slide inward.
Disclosure of Invention
The application provides a low-carbon green lightweight concrete aggregate and a preparation method thereof, which solve the problems provided above and also solve the technical problems of floating layering, insufficient strength and the like of each component lightweight material of the low-carbon green lightweight concrete in the using process.
The technical scheme of the invention is as follows: the low-carbon green lightweight concrete aggregate comprises the following components in percentage by mass: cement: low carbon active fine powder: light active ultrafine material: light organic fine powder: light mixed fine aggregate: combining fibers: YZ-1 type homogeneity regulator: high-performance additive: water =400 to 1200:50 to 300: 80-200: 200-300: 70-200: 3.5-6.0: 2.0-5.0: 12.4-20.0: 300 to 360.
Furthermore, the cement is a mixture of P.O42.5 or P.O52.5 cement conforming to GB175 and R.SAC42.5 cement conforming to GB20472, and the specific surface area is 380-450 m 2 Kg, the mass ratio of the components is 40-60: 40 to 60.
Further, the low-carbon active micro-fine powder is a mixture of fly ash, L70 phosphorus slag powder, building waste concrete, waste glass powder and municipal sludge, and the mass ratio of the low-carbon active micro-fine powder to the municipal sludge is 20-40: 10 to 20:20 to 40:10 to 30:20 to 30. Drying and grinding for 20-30min by a ball mill, wherein the specific surface area is 600-900 m 2 The activity of the catalyst is more than or equal to 80 percent per kg and 28 d.
Further, the light active ultrafine material is a mixture of hollow glass beads, floating beads and silica fume, wherein the particle size of hollow glass beads is less than or equal to 80 microns, and the mass ratio of the hollow glass beads, the floating beads and the silica fume is 30-40: 20 to 50:20 to 50.
Further, the light organic micro-fine powder is waste hard plastic powder, mainly is one or a mixture of more of ABS, POM, PS, PMMA, PC, PET, PBT, PPO and the like, has a particle size of 40 mu m or more and less than or equal to 80 mu m, a water content of 0.1 percent or less and an apparent density of 900-1200kg/m 3 。
Further, the light mixed fine aggregate is a mixture of light waste hard plastic particles, vitrified micro bubbles and machine-made sand, wherein the diameters of the light waste hard plastic particles and the machine-made sand are less than or equal to 4.75mm, the fineness modulus is 2.5-3.3, and the mass percentage is 40-60:10-30:30-50.
Further, the combined fiber is a composition of wood fiber and polypropylene fiber, and the mass percentage is 50-80: 20 to 50.
Further, the YZ-1 type homogeneity regulator is a mixed powder of chitosan, glucan and polymeric ferric sulfate, wherein the chitosan is low-molecular-weight chitosan, and the mass percentage of each component is 20-40: 20 to 30:30 to 60 percent.
Further, the polycarboxylate superplasticizer has a solid content of 10-15% and a water reduction rate of 30-40%.
A preparation method of a low-carbon green lightweight concrete aggregate comprises the following steps:
the method comprises the following steps: weighing cement, low-carbon active fine powder, light active ultrafine material, light organic fine powder, light mixed fine aggregate, composite fiber, YZ-1 type homogeneity regulator, high-performance additive and water according to a certain proportion.
Step two: mixing weighed water and a polycarboxylic acid water reducing agent to obtain a mixed solution, putting the weighed low-carbon active micro-fine powder, light active superfine material, light organic micro-fine powder, mixed fine aggregate, combined fiber and YZ-1 type homogeneity regulator into a mixer, uniformly mixing for 1-3min to obtain a mixed material, putting the mixed material into a stirrer, starting the stirrer, uniformly spraying the mixed solution into the mixed material, completing 4-5min, and continuously stirring for 10-15min to obtain mixed slurry.
Step three: and putting the mixed slurry into a pelleting machine for tabletting, slitting, rounding to form spherical particles, curing for 20-24h at room temperature, and then putting the spherical particles into a standard concrete curing room for curing for 28d to obtain the low-carbon green lightweight concrete aggregate.
The action mechanism of the invention is as follows:
1. the complementary synergy of the wood fiber and the polypropylene fiber, such as 1+1 > 2, in the combined fiber, particularly, after the two fibers are combined, the polypropylene fiber is inserted into the wood fiber macroscopic three-dimensional net structure from multiple directions and multiple dimensions, so that the defects of insufficient traction force of the wood fiber macroscopic three-dimensional net structure and insufficient capturing force of the polypropylene fiber net are overcome. Improves the macroscopic net-catching and drawing effects of the composite fiber powder cementing material and the conglomerate thereof, and reduces the floating layering of each component of the light material.
2. The YZ-1 type homogeneous regulator has chitosan with hydroxyl group, amino group and N-acetylamino group in the molecular chain, which can form various intramolecular and intermolecular hydrogen bonds. Meanwhile, the active groups on the chain are many, and grafting and copolymerization reactions can be carried out. The dextran molecules are connected with the chitosan molecular chain through grafting and copolymerization under the physical and chemical actions, and the unique triple ultramicro helical structure of the dextran reacts with the chitosan multi-active group, so that the adsorption and the net capture on cement, high-silicon calcium active powder materials, light active ultramicro materials and light organic micropowder are improved. Polyferric sulfate, chitosan and glucan form a multidimensional net-shaped complex structure under the chelation effect, and have better adsorption and net capturing force.
3. The YZ-1 type homogeneity regulator and the combined fiber have the synergistic effect of organic-inorganic composite homogeneity regulator in flocculating cement, high silicon calcium active powder material, light active superfine material, light organic superfine powder and other micro flocculating components. Then the macroscopic three-dimensional net structure of the combined fiber pulls the agglomerates together, so that the components are fully and uniformly mixed in the stirring process, and therefore the innovative synergetic effects of microscopic adsorption, net capture and macroscopic pulling solve the floating problem of the light active ultrafine material and the light organic fine powder in the process, and the whole body is more uniform.
The invention has the beneficial effects that:
the low-carbon green lightweight concrete aggregate is obtained by adopting organic solid waste and inorganic solid waste and utilizing the microscopic adsorption, net capture and macroscopic drawing synergistic effect of the YZ-1 type homogeneity regulator and the combined fiber, and has the advantages of light weight, heat preservation, energy conservation, waste utilization, low carbon, environmental protection and great significance.
Detailed Description
The technical solution of the present invention is further described in detail by the following examples, which are illustrative but not limiting of the present invention.
The preparation method of the low-carbon green lightweight concrete aggregate comprises the following steps:
the method comprises the following steps: the cement, the low-carbon active micro powder, the light active ultra-fine material, the light organic micro powder, the light mixed fine aggregate, the combined fiber, the YZ-1 type homogeneous regulator, the high-performance additive and the water are weighed according to the proportion.
Step two: mixing weighed water and a polycarboxylic acid water reducing agent to obtain a mixed solution, putting the weighed low-carbon active micro powder, light active ultra-fine material, light organic micro powder, mixed fine aggregate, combined fiber and YZ-1 type homogeneous regulator into a mixer, uniformly mixing for 1-3min to obtain a mixed material, putting the mixed material into a stirrer, starting the stirrer, uniformly spraying the mixed solution into the mixed material, completing 4-5min, and continuously stirring for 10-15min to obtain mixed slurry.
Step three: and putting the mixed slurry into a pelleting machine for tabletting, slitting, rounding to form spherical particles, curing for 20-24h at room temperature, and then putting the spherical particles into a standard concrete curing room for curing for 28d to obtain the low-carbon green lightweight concrete aggregate.
Ingredient mass ratios for examples 1-5 are given in the following table (kg/m) 3 )：
The quality indexes of the component materials of the combined fibers of the examples 1 to 5 are as follows:
the quality percentages of the components of the homogenizing regulator of the embodiment 1-5YZ-1 type are as follows:
| chitosan/% | Glucan/%) | Polymeric ferric sulfate/%) | |
| Example 1 | 20 | 20 | 60 |
| Example 2 | 30 | 20 | 50 |
| Example 3 | 40 | 30 | 30 |
| Example 4 | 30 | 30 | 40 |
| Example 5 | 30 | 20 | 50 |
The ingredient mass ratios of comparative examples 1 to 11 are as follows:
the quality indexes of the component materials of the combined fibers of the comparative examples 1 to 11 are as follows:
| wood fibre% | Polypropylene fiber% | |
| Example 3 | 70 | 30 |
| Comparative example 1 | 0 | 0 |
| Comparative example 2 | 70 | 30 |
| Comparative example 3 | 100 | 0 |
| Comparative example 4 | 0 | 100 |
| Comparative example 5 | 70 | 30 |
| Comparative example 6 | 70 | 30 |
| Comparative example 7 | 70 | 30 |
The mass percentages of the components of the homogenizing regulator of the embodiment 1-11YZ-1 type are as follows:
the performance indexes of the low-carbon green lightweight cement of examples 1-5 are as follows:
| 3d Strength (MPa) | 28d Strength (MPa) | Description of the phenomenon of stratification by adding Water | |
| Example 1 | 10.7 | 15.4 | No layering phenomenon in mixing and forming |
| Example 2 | 13.6 | 21.4 | No layering phenomenon in mixing and forming |
| Example 3 | 15.7 | 23.8 | No layering phenomenon in mixing and forming |
| Example 4 | 18.9 | 29.9 | No layering phenomenon in mixing and forming |
| Example 5 | 22.4 | 36.4 | No layering phenomenon in mixing and forming |
The performance criteria for comparative examples 1-7 are as follows:
| 3d Strength (MPa) | 28d Strength (MPa) | Description of the phenomenon of stratification by adding Water | |
| Comparative example 1 | 10.4 | 15.9 | Severe delamination occurs in the mixing and forming processes. |
| Comparative example 2 | 12.8 | 17.7 | Severe delamination occurs in the processes of stirring and forming. |
| Comparative example 3 | 13.4 | 19.0 | Machine-made sand sinking occurs in the mixing and forming processes. |
| Comparative example 4 | 14.1 | 20.5 | Machine-made sand sinking occurs in the mixing and forming processes. |
| Comparative example 5 | 14.0 | 21.3 | Machine-made sand sinking occurs in the mixing and forming processes. |
| Comparative example 6 | 12.7 | 18.7 | Machine-made sand sinking occurs in the mixing and forming processes. |
| Comparative example 7 | 13.5 | 21.7 | Machine-made sand sinking occurs in the mixing and forming processes. |
Cement mortar strength test method (ISO method) (GB/T17671) and the like. As is apparent from the above table, in examples 1 to 5, the mortar has a 3d strength of 10.7 to 22.4MPa and a 28d strength of 15.4 to 36.4MPa after the superplasticizer is doped.
As can be seen from comparative examples 1-2 and example 3, the combination fiber and the YZ-1 type leveling agent have a relatively excellent synergistic effect.
While the invention has been described in further detail in connection with specific embodiments thereof, it will be understood that the invention is not limited thereto, and that various other modifications and substitutions may be made by those skilled in the art without departing from the spirit of the invention, which should be considered to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. The low-carbon green lightweight concrete aggregate is characterized in that:
the coating comprises the following components in parts by weight:
400-1200 parts of cement;
50-300 parts of low-carbon active micro-fine powder;
80-200 parts of light active superfine material;
200-300 parts of light organic micro-powder;
70-200 parts of light mixed fine aggregate;
3.5-6.0 parts of combined fiber;
2.0 to 5.0 portions of YZ-1 type homogeneous regulator;
12.4 to 20.0 portions of high-performance admixture;
300-360 parts of water.
2. The low-carbon green lightweight concrete aggregate according to claim 1, characterized in that:
the coating comprises the following components in parts by weight:
400 parts of cement;
300 parts of low-carbon active fine powder;
150 parts of light active ultrafine material;
200 parts of light organic fine powder;
200 parts of light mixed fine aggregate;
3.5 parts of combined fibers;
2.0 parts of YZ-1 type homogeneous regulator;
12.4 parts of a high-performance additive;
300 parts of water.
3. The low-carbon green lightweight concrete aggregate according to claim 1, wherein:
the coating comprises the following components in parts by weight:
600 parts of cement;
200 parts of low-carbon active fine powder;
200 parts of light active superfine material;
200 parts of light organic fine powder;
100 parts of light mixed fine aggregate;
5.0 parts of combined fibers;
3.5 parts of YZ-1 type homogeneous regulator;
15.0 parts of high-performance additive;
320 parts of water.
4. The low-carbon green lightweight concrete aggregate according to claim 1, characterized in that:
the coating comprises the following components in parts by weight:
850 parts of cement;
100 parts of low-carbon active fine powder;
170 parts of light active superfine material;
200 parts of light organic fine powder;
150 parts of light mixed fine aggregate;
5.5 parts of combined fibers;
4.0 parts of YZ-1 type homogeneity regulator;
17.0 parts of high-performance admixture;
350 parts of water.
5. The low-carbon green lightweight concrete aggregate according to claim 1, characterized in that:
the coating comprises the following components in parts by weight:
1200 parts of cement;
50 parts of low-carbon active fine powder;
100 parts of light active ultrafine material;
300 parts of light organic fine powder;
100 parts of light mixed fine aggregate;
6.0 parts of combined fibers;
5.0 parts of YZ-1 type homogeneity regulator;
18.0 parts of high-performance additive;
350 parts of water.
6. The low-carbon green lightweight concrete aggregate according to claim 1, characterized in that:
the coating comprises the following components in parts by weight:
1200 parts of cement;
50 parts of low-carbon active fine powder;
80 parts of light active superfine material;
230 parts of light organic fine powder;
70 parts of light mixed fine aggregate;
5.5 parts of combined fibers;
4.5 parts of YZ-1 type homogeneous regulator;
20.0 parts of high-performance additive;
and 360 parts of water.
7. The low-carbon green lightweight concrete aggregate according to claim 1, wherein:
the cement is a mixture of P.O42.5 or P.O52.5 cement conforming to GB175 and R.SAC42.5 cement conforming to GB20472, and the specific surface area is 380-450m 2 Per kg, the mass ratio of the components is 40 to 60:40 to 60;
the low-carbon active micro powder is a mixture of fly ash, L70 phosphorus slag powder, building waste concrete, waste glass powder and municipal sludge, and the mass ratio of the mixture is 20-40: 10 to 20:20 to 40:10 to 30:20 to 30; drying and grinding for 20-30min by a ball mill, wherein the specific surface area is 600-900m 2 The activity of 28d is more than or equal to 80 percent per kg;
the light active superfine material is a mixture of hollow glass beads, floating beads and silica fume, wherein the particle size of hollow glass bead particles is less than or equal to 80 mu m, and the mass ratio of the hollow glass beads, the floating beads and the silica fume is 30 to 40:20 to 50:20 to 50;
the light organic micro-fine powder is waste hard plastic powder, is mainly a powder mixture of one or more of ABS, POM, PS, PMMA, PC, PET, PBT, PPO and the like, has a particle size of not less than 40 mu m and not more than 80 mu m, a water content of not more than 0.1 percent and an apparent density of 900-1200 kg/m.
8. The low-carbon green lightweight concrete aggregate according to claim 1, characterized in that:
the light mixed fine aggregate is a mixture of light waste hard plastic particles, vitrified micro-beads and machine-made sand, wherein the diameters of the light waste hard plastic particles and the machine-made sand are less than or equal to 4.75mm, the fineness modulus is 2.5-3.3, and the mass percentage is 40-60:10-30:30-50.
9. The low-carbon green lightweight concrete aggregate according to claim 1, characterized in that:
the combined fiber is a composition of wood fiber and polypropylene fiber, and the mass percentage is 50 to 80:20 to 50;
the YZ-1 type homogeneity regulator is a mixed powder of chitosan, glucan and polyferric sulfate, wherein the chitosan is low-molecular-weight chitosan, and the mass percentage of each component is 20-40: 20 to 30:30 to 60 percent;
the solid content of the polycarboxylate superplasticizer is 10% -15%, and the water reducing rate is 30% -40%.
10. The preparation method of the low-carbon green lightweight concrete aggregate is characterized by comprising the following steps of:
the method comprises the following steps: weighing cement, low-carbon active fine powder, light active ultrafine material, light organic fine powder, light mixed fine aggregate, composite fiber, YZ-1 type homogeneity regulator, high-performance additive and water according to a proportion;
step two: mixing weighed water with a polycarboxylic acid water reducing agent to obtain a mixed solution, putting the weighed low-carbon active micro-fine powder, light active superfine material, light organic micro-fine powder, mixed fine aggregate, combined fiber and YZ-1 type homogeneity regulator into a mixer, uniformly mixing for 1-3min to obtain a mixed material, putting the mixed material into a stirrer, starting the stirrer, uniformly spraying the mixed solution into the mixed material, completing 4-5min, and continuously stirring for 10-15min to obtain mixed slurry;
step three: and placing the mixed slurry into a pelleting machine for pelleting, slitting and rounding to form spherical particles, curing for 20-24h at room temperature, and placing the spherical particles into a standard concrete curing room for curing for 28d to obtain the low-carbon green lightweight concrete aggregate.
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